Dogcows Code - chaz/tint2/blob - src/battery/battery.c

   1 /**************************************************************************
   2 *
   3 * Tint2 : battery
   4 *
   5 * Copyright (C) 2009 Sebastian Reichel <elektranox@gmail.com>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License version 2
   9 * or any later version as published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18 **************************************************************************/
  19
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <cairo.h>
  24 #include <cairo-xlib.h>
  25 #include <pango/pangocairo.h>
  26
  27 #include "window.h"
  28 #include "server.h"
  29 #include "taskbar.h"
  30 #include "panel.h"
  31 #include "area.h"
  32 #include "battery.h"
  33 #include "clock.h"
  34
  35 PangoFontDescription *bat1_font_desc;
  36 PangoFontDescription *bat2_font_desc;
  37 struct batstate battery_state;
  38
  39 static char buf_bat_percentage[10];
  40 static char buf_bat_time[20];
  41
  42 int8_t battery_low_status;
  43 char* battery_low_cmd;
  44
  45 void update_battery(struct batstate *data) {
  46         FILE *fp;
  47         char tmp[25];
  48         int64_t energy_now = 0, energy_full = 0, current_now = 0;
  49         int seconds = 0;
  50         int8_t new_percentage = 0;
  51
  52         fp = fopen("/sys/class/power_supply/BAT0/energy_now", "r");
  53         if(fp != NULL) {
  54                 fgets(tmp, sizeof tmp, fp);
  55                 energy_now = atoi(tmp);
  56                 fclose(fp);
  57         } else printf("ERROR: battery applet can't open energy_now\n");
  58
  59         fp = fopen("/sys/class/power_supply/BAT0/energy_full", "r");
  60         if(fp != NULL) {
  61                 fgets(tmp, sizeof tmp, fp);
  62                 energy_full = atoi(tmp);
  63                 fclose(fp);
  64         } else printf("ERROR: battery applet can't open energy_full\n");
  65
  66         fp = fopen("/sys/class/power_supply/BAT0/current_now", "r");
  67         if(fp != NULL) {
  68                 fgets(tmp, sizeof tmp, fp);
  69                 current_now = atoi(tmp);
  70                 fclose(fp);
  71         } else printf("ERROR: battery applet can't open current_now\n");
  72
  73         fp = fopen("/sys/class/power_supply/BAT0/status", "r");
  74         if(fp != NULL) {
  75                 fgets(tmp, sizeof tmp, fp);
  76                 fclose(fp);
  77         } else printf("ERROR: battery applet can't open status");
  78
  79         data->state = BATTERY_UNKNOWN;
  80         if(strcasecmp(tmp, "Charging\n")==0) data->state = BATTERY_CHARGING;
  81         if(strcasecmp(tmp, "Discharging\n")==0) data->state = BATTERY_DISCHARGING;
  82
  83         if(current_now > 0) {
  84                 switch(data->state) {
  85                         case BATTERY_CHARGING:
  86                                 seconds = 3600 * (energy_full - energy_now) / current_now;
  87                                 break;
  88                         case BATTERY_DISCHARGING:
  89                                 seconds = 3600 * energy_now / current_now;
  90                                 break;
  91                         default:
  92                                 seconds = 0;
  93                                 break;
  94                 }
  95         } else seconds = 0;
  96
  97         data->time.hours = seconds / 3600;
  98         seconds -= 3600 * data->time.hours;
  99         data->time.minutes = seconds / 60;
 100         seconds -= 60 * data->time.minutes;
 101         data->time.seconds = seconds;
 102
 103         new_percentage = (energy_now*100)/energy_full;
 104
 105         if(battery_low_status != 0 && battery_low_status == new_percentage && data->percentage > new_percentage) {
 106                 printf("battery low, executing: %s\n", battery_low_cmd);
 107                 if(battery_low_cmd) system(battery_low_cmd);
 108         }
 109
 110         data->percentage = new_percentage;
 111 }
 112
 113 void init_battery()
 114 {
 115    Panel *panel;
 116    Battery *battery;
 117    int i, bat_percentage_height, bat_percentage_height_ink, bat_time_height, bat_time_height_ink;
 118
 119         for (i=0 ; i < nb_panel ; i++) {
 120                 panel = &panel1[i];
 121                 battery = &panel->battery;
 122
 123                 battery->area.parent = panel;
 124                 battery->area.panel = panel;
 125                 battery->area._draw_foreground = draw_battery;
 126                 battery->area._resize = resize_battery;
 127
 128                 if (!battery->area.on_screen) continue;
 129
 130                 battery->area.posy = panel->area.pix.border.width + panel->area.paddingy;
 131                 battery->area.height = panel->area.height - (2 * battery->area.posy);
 132                 battery->area.resize = 1;
 133                 battery->area.redraw = 1;
 134
 135                 update_battery(&battery_state);
 136                 snprintf(buf_bat_percentage, sizeof(buf_bat_percentage), "%d%%", battery_state.percentage);
 137                 snprintf(buf_bat_time, sizeof(buf_bat_time), "%02d:%02d", battery_state.time.hours, battery_state.time.minutes);
 138
 139                 get_text_size(bat1_font_desc, &bat_percentage_height_ink, &bat_percentage_height, panel->area.height, buf_bat_percentage, strlen(buf_bat_percentage));
 140                 battery->bat1_posy = (battery->area.height - bat_percentage_height) / 2;
 141
 142                 get_text_size(bat2_font_desc, &bat_time_height_ink, &bat_time_height, panel->area.height, buf_bat_time, strlen(buf_bat_time));
 143
 144                 battery->bat1_posy -= ((bat_time_height_ink + 2) / 2);
 145                 battery->bat2_posy = battery->bat1_posy + bat_percentage_height + 2 - (bat_percentage_height - bat_percentage_height_ink)/2 - (bat_time_height - bat_time_height_ink)/2;
 146         }
 147 }
 148
 149
 150 void draw_battery (void *obj, cairo_t *c, int active)
 151 {
 152         Battery *battery = obj;
 153         PangoLayout *layout;
 154
 155         layout = pango_cairo_create_layout (c);
 156
 157         // draw layout
 158         pango_layout_set_font_description(layout, bat1_font_desc);
 159         pango_layout_set_width(layout, battery->area.width * PANGO_SCALE);
 160         pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
 161         pango_layout_set_text(layout, buf_bat_percentage, strlen(buf_bat_percentage));
 162
 163         cairo_set_source_rgba(c, battery->font.color[0], battery->font.color[1], battery->font.color[2], battery->font.alpha);
 164
 165         pango_cairo_update_layout(c, layout);
 166         cairo_move_to(c, 0, battery->bat1_posy);
 167         pango_cairo_show_layout(c, layout);
 168
 169         pango_layout_set_font_description(layout, bat2_font_desc);
 170         pango_layout_set_indent(layout, 0);
 171         pango_layout_set_text(layout, buf_bat_time, strlen(buf_bat_time));
 172         pango_layout_set_width(layout, battery->area.width * PANGO_SCALE);
 173
 174         pango_cairo_update_layout(c, layout);
 175         cairo_move_to(c, 0, battery->bat2_posy);
 176         pango_cairo_show_layout(c, layout);
 177
 178         g_object_unref(layout);
 179 }
 180
 181 void resize_battery(void *obj)
 182 {
 183         Battery *battery = obj;
 184         PangoLayout *layout;
 185         int percentage_width, time_width, new_width;
 186
 187         percentage_width = time_width = 0;
 188         battery->area.redraw = 1;
 189
 190         snprintf(buf_bat_percentage, sizeof(buf_bat_percentage), "%d%%", battery_state.percentage);
 191         snprintf(buf_bat_time, sizeof(buf_bat_time), "%02d:%02d", battery_state.time.hours, battery_state.time.minutes);
 192
 193         cairo_surface_t *cs;
 194         cairo_t *c;
 195         Pixmap pmap;
 196         pmap = XCreatePixmap(server.dsp, server.root_win, battery->area.width, battery->area.height, server.depth);
 197
 198         cs = cairo_xlib_surface_create(server.dsp, pmap, server.visual, battery->area.width, battery->area.height);
 199         c = cairo_create(cs);
 200         layout = pango_cairo_create_layout(c);
 201
 202         // check width
 203         pango_layout_set_font_description(layout, bat1_font_desc);
 204         pango_layout_set_indent(layout, 0);
 205         pango_layout_set_text(layout, buf_bat_percentage, strlen(buf_bat_percentage));
 206         pango_layout_get_pixel_size(layout, &percentage_width, NULL);
 207
 208         pango_layout_set_font_description(layout, bat2_font_desc);
 209         pango_layout_set_indent(layout, 0);
 210         pango_layout_set_text(layout, buf_bat_time, strlen(buf_bat_time));
 211         pango_layout_get_pixel_size(layout, &time_width, NULL);
 212
 213         if(percentage_width > time_width) new_width = percentage_width;
 214         else new_width = time_width;
 215
 216         new_width += (2*battery->area.paddingxlr) + (2*battery->area.pix.border.width);
 217
 218         if(new_width > battery->area.width || new_width < (battery->area.width-6)) {
 219                 int i;
 220                 Panel *panel = ((Area*)obj)->panel;
 221
 222                 printf("battery_width %d, new_width %d\n", battery->area.width, new_width);
 223
 224                 // resize battery
 225                 // we try to limit the number of resize
 226                 battery->area.width = new_width + 1;
 227                 battery->area.posx = panel->area.width - battery->area.width - panel->area.paddingxlr - panel->area.pix.border.width;
 228                 if (panel->clock.area.on_screen)
 229                         battery->area.posx -= (panel->clock.area.width + panel->area.paddingx);
 230
 231                 // resize other objects on panel
 232                 for (i=0 ; i < nb_panel ; i++)
 233                         panel1[i].area.resize = 1;
 234
 235                 systray.area.resize = 1;
 236                 panel_refresh = 1;
 237         }
 238
 239         g_object_unref (layout);
 240         cairo_destroy (c);
 241         cairo_surface_destroy (cs);
 242         XFreePixmap (server.dsp, pmap);
 243 }
 244